Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e36ee947dc0f1…

MALICIOUS

PDF

170.1 KB Created: 2021-06-18 22:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 967d2a2d068115b0f5adfec846494cd7 SHA-1: 128cad77478df779e9031346c76221f659e6c776 SHA-256: 083e36ee947dc0f13c67617f8304a453e99bf13a375f750602ffd3aa32f2ef4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially malicious content is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7d14b9a7---38369413522.pdf In PDF document text
    • http://rld-carbon.ru/file/wamevifubosumovuvinexan.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6e062572f---xobefimipu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-15/20210515155518843075.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2978e233f0a137e0e130057ba2d36ecd/pefukabupixoje.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/de7256331543aa8fcaf6c0a3f89a11cc/36845160219.pdfIn PDF document text
    • http://ahchala.com/img/file/94794294604.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/nudogufow.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nixeri.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/58e03991e580d4e3ff0697efa1b32724/mobave.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kpcq240e1hfi9n8pnukbv231b5/76151773594.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/46007c34e5e09a1264d42495edeba4ab/papetowotomekotukut.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a29848b63cfd934a7c298b30ff0adc57/xotubip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragonvale+how+to+breed+sun+dragonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000210b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210B6 23544 bytes
SHA-256: 1270bb2a76c25b58cffd66111d531feaebbdb7150eb9c046e6af21b560717914
font_01_sfnt_off00025ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BA2 5380 bytes
SHA-256: 40117b7b5c3bdeebd5e89e5f6bfa7f1e31afb9d255ba7f7dfd4c6f4b8664c4e3
font_02_sfnt_off00026dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DFA 14856 bytes
SHA-256: 32e87c0f4a87220ef6047fa1a07c2674c8e4ea53fe2d1d634cbf7e5ca47ca604

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